<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">

    <title>Document</title>
    <style>
        div{
            width: 100%;
            height: 150px;
            background-color: darkgrey;
            display: flex;
            justify-content: space-between;
            align-items:flex-end ;

        }
        div>span{
            background-color: aqua;
            width: 20px;
        }
    </style>
</head>
<body>
<div>
    <span>1</span>
    <span>2</span>
    <span>3</span>
</div>

</body>
</html>